1. currently one is 10 ft. and two are 18 ft
2. avg varies on condition anywhere from 10-25 or so...
3.25 ft as high as i go..no need to go further
4.Sacramento, CA

things as a hunter i find key in a tree stand for us in CA....lightweight, very strong, NO SQUEKS, easy on and off a tree.....just for thought

not sure what parts you manufacture, but make them lightweight, strong and silent....and any tree stand company would want to use your parts...